Stopping and starting mechanism for shoe stitching or other machines



Dec. 1, 1925- J. R. OLIVER STOPPING AND STARTING MECHANISM FOR SHOESTITCHING 0R OTHER MACHINES I" Sheets-Sheet l Ufa Flgl. 35h62 46 7/ g/ n13@ E! 125154 dohn H Ol'wer RWMWMW Ays.

Dec. l. 1925- 1,564,103

l J. R. OLIVER STOPPING AND STARTING MECHANISM F'OR` SHOE STITCHING OROTHER MACHNES Filed April 30, 1925 Sheets-Sme?I 2 5 w ZM 129 a [l0lnvenTov v John R.Olver ATTys.

Patented Dee. l, 1925.

NUNITED STATES PATENT OFFICE.

JOI-IN ROG-ER OLIVER, OF MEDFIELD, M'ASSACHUSEITS, ASSIGNOR TO REECESHOE MACHINERY COMPANY,.OF BOSTON, MASSACHUSETTS, .A CORGRATION F MAINE.

STOPIPING AND STARTING: MECHANISM FOR .SHOE STITCHING OR OTHER MACHINES.

Application lled April 30, 1925. Serial No. 26,948.

To all whom, 'it may conce/rn.:

Be it known that I, JOHN ROGER OLIVER, a" citizen of the United States,vresiding at liliedtielthin the county of Norfolk, State ofhassaclmsctts, have invented certain new and useful Improvements inStopping and Starting Mechanism for Shoe Stitching or Other Machines, ofwhich the .following is aspecification. n

This invention is a novel stopping and starting mechanism for shoestitching or other machines, and is shownapplied, as an example, to theso-called loutsole stitching machine, by `which the outsole and welt ofa shoe are stitched together, although the invention is applicable tovarious other types of power driven stitching machines, such as the-wellknown but-ton hole sewing machine, and other machines wherein it isrequired to `bring the main or operating shaftto rest in a definiteposition without undue shock.

The main object of the present invention isv to afl'ordv a stopping andstarting mecha nism which will be 4more efficient in the respectsalready mentioned and more conrement.` durable and reliable inoperation.

Other and more particular object-sand advantages of the presentinvention will be explained in the hereinafter following description ofone form or embodiment of the invention, or willbe apparent to thoseskilled in the art.

Tot-he attainment of 'the objects and ad- .vantages referred to thepresent invention consists in the novel machine, mechanism,combinations, arrangements, devices and other features herein describedor illus" trated y y y l l l i- The'presel-it invention, as tovccrtainfeaturcsLmay be considered as an improvement on the mechanism slmwn inmy prior Patent 1m32.153s.'-granted April 7, 1925; and as the generalmechanism, and its mode of use in the shoe stitching machine, may besimilar to the priorlnitent, many details are omitted herefrom and maybc ascertained by reference tothe prior patent.

In the accompanying drawings, forming a part hereof, Fig. l. is arearelevation and central longitudinal vertical section of a mechanismen'ibodving the present invention.

Fig. 2 is a central horizontal section of certain parts shown in Fig. l.

F ig. 3 is a. front elevation of certain parts.

Fig. t is a left elevation of certain parts shown in Fig. 3. y e

Fig. is a part section taken on the line 5-5 of Fig. 4c.

The general object of such a stop motion may be substantially as setforth in said patent, as follows: When the seam is finished or the timeto stop has arrived the pedal or other control member operates to putthe stopping mechanism into effect. `For example when t-he pedal isreleased and rises this may unclutch the stitching shaft from the powerdrive and at the same time apply friction to effect stoppage of theshaft. Such stoppage may be quick in point of time and without shock,but will leave the shaft 1n an. indeterminate position; and themechanism `hereof operates thereafter to turn the shaft slowly to thedesired final stopping position, usually with the needle retracted fromthe work. The slight reaction of the parts after the `friction stoppagemay be utilized to set into action the supplemental mechanism, forexample through a latch or trigger as described in said patent. At theconclusion of the final rotation the shaft will be finally stopped inthe desired definite position.

The features particularly differentiating the present invention fromsaid patent may beexplained generally as follows:

In the prior patent, after the `first stop* page the engagement for thesupplemental slow drive was variable in time, sometimes consuming aperiod almost as lgreat as a complete rotation at the slow speed beforethe engagement thereof,-owing to the possible dbelay in theregistrationof` a certain clutch member or driving dog with thecooperating member onthe shaft. The present invention overcomes this possible delay andrenders the action quicker and more uniform, namely b-y affordinggreater opportunity for the engagementV of the slow driving and drivenclutch members, for eX- ample by a plurality of independent drivingclutch dogs and associated elements cooperating With the same drivenclutch member.

In vthe prior patent the power connections from the shaft of the machineto the slow driving clutch `were complicated; in the' presentimprovement. an arrangement is provided considerably simplifying thedrive and rendering it more effective and compact.

In the prior patent the final stoppage was secured at .the desired pointthrough impact members brought into relation upon throwing out the slowdrive. The present improvement dispenses with all impact, and bysimplified mechanism provides for final stoppage through a frictionmeans or brake, with which itis possible to give immediate stoppage atthe proper point in view of the slow speed and low moment-um of theparts.

The belt 21 for the slow drive may correspond with the belt having thesaine reference number -in the prior patent, but the connections betweenthebelt and the drum 110 on the main stitching shaft 25 are different.

In the prior patent they included pulley,

shaft, helical gear,fdriveii gear, shaft, helical gear, driven gear,shaft and pinion. In the present constructionv the belt 21 runs' on apulley 216, mounted on a shaft 21.7 jouriialled in a special'bra'cket218 located directly abovethe dru-in. The pulley and belt may be locatedat either end of the shaft 217, either at the front orat the rear of theniachin/e, as 'indicated by Fig. 4'. It is Vonly necessary yto use aworm 219 engaging a toothed-worin wheel 220 on the drum 110, giving theproperspeed reductionandthe desired slow speed ofthe drum, which may bevabout 1/5th of the full speed of the stitching shaft. -f 5 1 The normaldrive of the stitching shaft may be thesame as in the prior patent. Thefoot pedal or controller operates through the fork 43, the studs 44of'which engage in groove 45 of the hub 46 of a clutch member Or-co'ne47 rotated loosely on the stitching shaft at the full driving speed. The`rcooperating outer clutch cone 48 is mounted on a. disk 49, the hub ofwhich is keyed to the stitching shaft. The rim or peripheral surface 50of the disk 49 constitutesa braking pulley and is engaged'by-front andrear brake straps 60 having top lugs 61 coniiected by a bolt 62 andlowerlugs 65 connected by a bolt 74 and ai spring 75, all of which maybe varranged as in said pateiit.-

The disk 49 also carries a vclutch member for the slow drive in the formof an annular plate 122, having a clutch recess 123 adapted 4to receivea dog of the slow driving means, aswill be described.A Inside of thedrum 110 the main shaft is surrounded by a sleeve 124 surrounded by aspring 125'accominodated in a recess in the druin and operating to pressthe ldrum toward the left, that is, toward the right in Fig. 1, tendingto engage the slow drive. The spring 125 backs up against a xed sleeve128 supported by a bracket 127. 'These parts coi'- respond in functionand reference number w with the prior patent. Alsocoiresponding with theprior patent is a follower or stud 164 arranged below the drum andadapted to rise, when released through the latch or 'trigger mechanismalready referred to, and indue time to engage the cam groove in thedrum, so that the drum operates to cam itself along the main shaft afterthe.

clutching to effect the unclutching of the slow drive. As in said patentthe drum 110 herein is also shown formed with a peripheral flange 129cooperating with guards 130 and 172 at certain parts of the stoppingcycle, and three buttonsor projections 186, in place lof the singlebutton bearing the same number in the patent. The several elements ofmechanism shown in Fig. 1 thereof below and associated with the camfollower stud 164 are indicated as identical with the prior patent andtherefore are not herein described. In the prior patent the drum 110 wasformed with a single cam groove, which would incur varying delays in theremoving of the slow drive after the preliminary frictional stoppage ofthe machine. I will now describe that part of the present improvementwhich provides for quickening materially the engagement of theslowdrive, and itssubsequent disengagement. e.

Instead of a single slow clutch dog on drum 110 as in the prior patentthe present construction indicates a plurality, namely three clutch dogs222, and these moreover are not rigid parts of the slow rotating drum110, but are slid-able therein so that while one of them engages thesingle 'clutch recess 123 in the disk 49 .the other two may yieldlongitudinally, this-yielding moreover being made to serve a function,as will be described. Each of the three dogs is shownas having a squaredfront or advancing edge, but preferably a bevelled rear edge 223. Eachof the dogs vis in the form of a bolt or sliding bar projectinglengthwise from the drum 110 and'extending through an appropriate recessin the drum, to where the inner or right hand Vend of the dog is formedand arranged tocooperate in the cam action. To this purpose eachof thedogs has its inner end bevelled at 224 to constitute a part` of one ofthe inclined walls'of a corresponding cam groove.y Also its inner end isincline, at 225, forming an 4upslanting surface upon 'which'the camfollower 164 may ride out'of4 sition 227 shown in Fig. 3, in which iteX- tends directly into the corresponding one of the cam grooves,effectually rendering that cam inoperative. f `It will be observed thatthe member 110, herein termed a `drum for convenience, although it mighttake various forms, yperforms various functions. It is driven slowlythrough the connections 216vto 220 already described, and thus is apartof the supplemental or slow rotating means". It carries the clutchdogs cooperating with the recessed clutch member 122and in that psenseis a clutch member, sliding longitudinally on the main shaft. It is alsoa controlling cam .for the slow drive, cooperating with the fol.- loweror stud 164, since the engagement of the'follower with the drumcamgrooves causes the drum member to cam itself longitudinally foroperating the clutch. The operation is assisted by the guard members 130and 172 already mentioned, while each.. of .the buttons 186 takes partin the operation Aof resetting .the latch'mechanisni, Vwhich is operatedin accordance with the` patent, to control the follower 164 and therebycause the slow drive to be disengaged. V

Instead of a single peripheral camion the drum 110, as in the patent,with (the possible attendant delay inengagementpthe present mechanismshows the drum formed with a plurality, namely three peripheral'cams229, each one corresponding with one of the'dogs 222, and the threeaccommodated inthe periphery of the drum in an overlapping man ner asindicated by Fig. 3. Each of the cams 229 commences with an inwardincline or entrance portion 230, such as to let' "the'fo1- lower 164into the groove in a smooth and quiet manner. The iirst part of each camgroove is a dwell 281, which is partly bounded at the left by the rightor interior end of the corresponding dog. Each cam groovethereafter'takes a leftward slant-232, which also is partly bounded bythe dog, namely by the bevelled end 224 of the dog.. The slantingportion of the cam is followed by a second dwell 233; which terminates'anvelevating in cline- 234 adapted to throw the 'follower' down and outinv a smooth quiet manner. Associated withthe inclined portion 232 ofeach cam groove is shown a spring guard v162. y'This operates to preventsudden engagement of the Vfollower with the inclined portion of the camand possible shock. Vhen the corresponding dog is thrust inwardly to itsabnormal position 227 this cooperates with the guard 162, the inclinedsurface 225 of the dog elevating the follower and delivering it on topof the guard 162, and so rendering the cam groove inoperative.

Before describing the operation of the parts thus far enumerated the newparts constituting the final stopping' means Will be referred to. Forthis purpose the gear 220 on thevdrum isutilized as a iiange, and itslongitudinal movements transmitted to the iinal brake. A. cross shaft256 is shown, somewhat below the toothed drum iiange 220, this shaftcarrying a pair of arms 257 having double flanged heads 258 embracingthe sides of the drum flange, as best shown in Fig. 2. lOutwardlyextending pins 259 on the heads 258 extend into slots 260 formed inlongitudinal bars 261projecting toward the right, in Figs. 1 and 2toward the-left, from `a final stopping friction cone 262 engaging acomplementary cone 263 secured to thefdisk 49 keyed tof-themain shaft.The pins 259 have a certain amount` of free `play in the slots 260, butwhen thrust fully tothe right they press against; pins 265 slidinglongitudinally. inthe bars 261, each of the sliding `pins having acollar 266 pressed against by a-spring 267V 'adjustable in tension bylock nuts 268; The movement of the pins 259 toward Vthe pins .265 first'applies spring pressure to 4thebrake cone 262, and .inally apositiveprfessure, giving suiciently forcible frictionto effectquickstoppalge of theslowly turning parts. i

The operation may be substantially as follows: The leteup ofthe pedalimmediately opens the friction drive clutch 47, 48, and applies thebrake bands 60 to the disk 50, `thus promptly and smoothlyvstopping theshaft. During the stopping the parts are strained, and coincident withkthe stoppage a reaction occurs which springsthe trigger described inthe prior patent, thusinitiating the further operations. Duringstitching the drum 110 is held to the right by the `guard 130- as seenin Fig. 3, against ythe tendency of the drum spring 125 tov throw thedrum to the left and engage the' slow drive.' After the first stoppagelthe trigger control operates to depress the guard 130, thus releasingthe drum 110, which' isV 'thereupon thrown to the left. The samemovement releases the pressure of thebrake band 60, leaving the shaftfree. hen'the drunr is thrown to the'left one of thethree' dogs 222 will`quickly engage in theclutch recess V123. lThis action is almostimmediate, iii-'spite of the slow speed of the drum, because of theemployment of three dogs. As soon as the dog engages the recess the slowdrive begins. The slow rotation of the drum is transmitted through theVrecessedclutch member 122 to the disk 49 and the main shaft. The twodogs `that are not in driving engagement are thrust 'relatively to theright, to the dotted position 227 `in Fig. 3, thus entering`thecorresponding cam grooves and rendering them inoperative as alreadydescribed. The cam groove corresponding to the 'driving dog remainsoperative. The leftward movement of the drum whichy engages the slowdrive also operates through connections shown in the prior patent torelease or normal position.

the follower 16st,y which 'is 'snapped upwardly groove,correspondingn'fith the operating dog, the cam becomes effective. `Theconcentric cam `portion y231is not directly in line' with'the follower164 in Fig-B-,Abnt will have` been. moved in line with'itl by `theleftwa'rdshift=of 4the drum.` The revolution.. of the drum causes thefollower to travel-A along' the 'dwell 231 and 'thence through theinclined cam portion232, which operates tocam-the drum to the'right.'The length of the cam incline-232 is clearly such as to throw the drumlconsiderably beyond the normal position indicatedl in Fig,y 3. The slowdrive becomes nnclutched when the follower has reached a'point `aboutmidwayalong the cam groove 232, and thereafter the rotation of the mainshaftis only by momentum, while thedrum continues to be turned at slowspeed by power. As the vd-rumis thrown to its furthest'righti handposition its flange 220, operating through the elements shown in Fig.2-will 'causethe application ofthe final stopping brake262.

rlhe main shaftv is thus stopped in thereq'uire'd final vpositionwithoutV shock. .The continued rotation of the drumrestores the variousparts ofthe mechanismto original Y Thu'soneiof theb-ub ,tons 186 on thedrum flange 129 operates as in theY prior patent to reset the main latchorr trigger. This` action also throwsy up the guard 13() to the leftofthe 'langc129- The guard 172 is thrown up'momentarily 'in order tohol-d the drum completely to the right until the follower 1641 has beenelevated smoothly out of the cam sl`ot-,"so as to avoid wear. Finallythe `follower 164 is pulled down away from the cam and latched there,lthe Supplemental guard 172 being pulled down at the same timespermitting the ,flange 129 to contactthe guard130, thus restoring theparts to the position shown `in Fig. 3, with everything in readiness forre newed stitching -by wsimply depressing the pedal and engaging themain drive'clutch 47, 48.

lt will thus bev seen that there has been the combination, with a shaftthereof, of

stop means operative after disconnection of power vto bring thefsh'aftto rest without shock in an indeterminate position, and slow powergmeanscoming into action after such indeterminate stoppage for restarting androtatingthe shaft slowly to a predetermined 'final position; said slowpower vmeans com prising a drum loosely surrounding the -p'ower'means4coming into action after such lindetermina-te `stoppage' forrestartingand rotating the shaft slowly to a predetermined final position, vmeanskfor `throwing out the -slowQspeed power, and a frictionbrake ap- :pliedto ,stop the z slow rotating shaft at a predetermined point.

3. In a high speed .power driven machine, thecombination, with a shaftthereof, of stop' means yoperative `after disconnection of power toybring the shaft to rest yWithout shock inarr indeterminate position,slow power means coming i-nto action after such indeterminate vstoppagefor restarting and rotating the shaft slowly to a predetermined finalposition, comprising a drum slidableon the shaft, power means forturningthe drum, a clutchbetween thedrum and shaft, means operativeat adefinite .point in the shafts rotation for shifting the drum-.andthereby openingv said clutch, and means operated bythe shiftingof thedrum for ap- -plyingv friction to cause final stoppage of the shaft.

4. The combination as in claim 3 and wherein .the last mentioned meanscomprises la-,trictiofn cone on'the shaft, a complementary cone slidablelongitudinally, bar veziten'ding longitudinally and connectedtol operatesaid slidable cone, said bar having a sloti,-and a yielding contacttherein, and a pusher moved by the drum and said slot. i

f 5. In ahigh speed power driven machine, the combination, with a shaftthereof, of stop means operative after disconnection of power to bringthe shaft to rest wit-hout shock in an indeterminateposition, and slowpower means coming linto action after such indeterminate stoppage forrestarting and rotating the shaft slowly to a predetermined finalposition, comprising` a clutch member on the shaft with single shoulder,and a plurality of clutch dogs engageable therewith.

The con'ibination as in claim and wherein the several dogs areyieldingly mounted so that one may engage while the others yield toinoperative positions.

7. In a high speed power driven machine, the combination, with a shaftthereof, of stop means operative after disconnection of power to bringthe shaft to rest without shock in an indeterminate position, and Slowpower means coming into act'ion after such indeterminate stoppage forrestarting and rotating the shaft slowly to a predetermined finalposition, comprising aA drum loosely surrounding the shaft and slidablethereon, connections rotating said drum at low speed, a plurality -ofclutch dogs on said drum, and a clutch member on the shaft engageable byany one of the clutch dogs.

8. The combination as in claim 7 and wherein the several clutch dogs areslidable in said drum, whereby all but the one making clutchingengagement may yield to inoperative positions.

9. The combination as in claim 7 an wherein the drum is formed with aplurality f of cams engageable with the same follower, and when soengaged adapted to cam the drum in a direction to disengage the clutch.l0. The combination as in claim 7 and wherein the drum is formed with aplurality of cams engageable with the same follower., and when soengaged adapted to cam the drum in a direction to disengage the clutch,and each dog arranged to slide on said drum when another of said dogsenters clutching engagement, and thereby render inoperative thecorresponding cam.

1l. The combination as in claim 7 and wherein the drum is formed with aplurality of cams engageable with the same follower, and when so engagedadapted to cam the drum 4in a direction to disengage the clutch andapply a final stop to the shaft.

In testimony whereof, I have affixed my signature hereto.

JOI-IN ROGER OLIVER.

